2.66.Set Up:At this point Voyager 1 is from the sun and the earth is from the sun, onthe same side as Voyager 1. Thus, Voyager 1 is from the earth. The speed of the radio waves isSolve:2.67.Set Up:Solve:2.68.Set Up:At the auto and truck are at the same position. The auto overtakes the truck when after time Tthey have both traveled a distance d.Solve: (a)Apply to the motion of each vehicle. The auto has and soThe truck has and so Combining these two equa-tions gives and Then (b)2.69.Set Up:Let dbe the distance from home to work. Solve: (a)The time to get to work is The time to return home is The average speed forthe round trip is the total distance 2ddivided by the total time (b)The travel times at each speed are not the same. More time is spent traveling at 40 mph so the average speed isless than Reflect:If the two average speeds for each one-way trip are and then the average speed for the roundtrip isIf then the average speed is this speed If the speeds differ a lot, then the average
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